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SCITUATE, R. I. — Foresters began noticing the patches of dying pines and denuded oaks, and grew concerned. Warmer winters and drier summers had sent invasive insects and diseases marching northward, killing the trees. If the dieback continued, some woodlands could become shrub land. Most trees can migrate only as fast as their seeds disperse — and if current warming trends hold, the climate this century will change